NO. 4 FLEA GENUS PEROMYSCOPSYLLA — JOHNSON AND TRAUB 1/ 



a great deal of reliance has been placed on host preference in deter- 

 mination of this flea. 



Length. — Male, 2.1-2.2 mm. ; female, 2.1-2.5 mm. 



Types. — Holotype, male, U.S.P.H.S. Hygienic Laboratory No. 

 199-6, from Neotoma sp., Tin Cup Creek, southwest of Darby, Mont. ; 

 allotype, female, U.S.P.H.S. Hygienic Laboratory No. 161-6, from 

 Neotoma sp., Spoon Creek, southwest of Darby, Mont. 



Records of Specimens Examined 



Canada. British Columbia (Ochotona sp., Peromyscus sp., Neotoma sp., 

 N. cinerea). 



United States. Montana: Ravalli County, "pack rat," "pine squirrel," 

 "mountain rat," "wood rat." Utah: Cache County {Neotoma cinerea: one 

 female, determination questionable). 



PEROMYSCOPSYLLA HESPEROMYS ADELPHA (Rothschild, 19 15) 



Figures 22, 25, 29-31, 34 



Leptopsylla adelpha Rothschild, Nov. Zool., vol. 22, p. 304, fig. 4, June 1915. — 

 Jordan and Rothschild, Ectoparasites, vol. i, p. 58, fig. 62, December 1915. 



Ctenopsylla adelpha Wagner, Akad. Nauk S.S.S.R. Zool. Inst., Parazitol. 

 Sbornik (Mag. Parasitol. Mus. Zool. Acad. Sci.), Leningrad, vol. i, p. 147, 

 pi. 13, fig. 90, 1930 (part, figure and description are draco Hopkins, 1951). 



Peromyscopsylla hemisphaerimn Stewart, Pan-Pacific Ent., vol. 16, p. 25, figs. 

 16, 17, 1940 (new synonymy). 



Peromyscopsylla adelpha Jellison and Good, U. S. Publ. Health Serv., Nat. 

 Inst. Health Bull. 178, p. 121, 1942. 



Peromyscopsylla hemisphacrium Hubbard, Fleas of western North America, 



PP- 329, 331, fig- 198, 1947- 

 Peromyscopsylla adelpha Hubbard, Fleas of western North America, p. 336, 



fig. 202, 1951 (part, male description and figures are draco Hopkins). 

 Peromyscopsylla hesperoniys hemisphaermm Holland, Canada Dept. Agr. 



Techn. Bull. No. 70, p. 117, figs. 323, 324, h, 1949. — Hopkins, Ann. Mag. 



Nat. Hist, ser. 12, vol. 4, p. 541, 1951. 

 Peromyscopsylla hesperomys adelpha Hopkins, Ann. Mag. Nat. Hist., ser. 12, 



vol. 4. P- 541, 1 95 1. 



This subspecies of hesperoniys is smaller than hesperomys hespero- 

 mys and h. ravalliensis and may be distinguished in the male from h. 

 hesperomys by the following points : The characteristic bristle on the 

 posterior margin of P. is usually longer than one-half width of F. 

 (figs. 29-31) ; the ventral and dorsal margins of P. are almost paral- 

 lel, not widely divergent, as in the type subspecies, and the ventral 

 margin is more than one-half the length of the upper (average meas- 

 urements: upper, 148 microns, lower 95 microns). The shape of F. 

 distinguishes this subspecies from hesperomys pacifica and hesperomys 



